KHUN FAMILY. 3G1 



5. NOTHOL.ENA. Fronds once or twice pinnate, woolly, scaly or powdery be- 



neath; fruit-dots at the ends of the vein*, turmiiiL' a line next the margin uf 

 the divisions. 



3. Spore-cases on the brick along the margin of the frond, pmr'nh-d with an invo- 

 lucre formed of its reflexed and more or less ulu 1-1 <l iu>in/in. 



6. ADIAXTUM. Fruit-dot-* :it the ends of the vein-;, borne on the inner side of a 



reflexed portion of the margin. Stalk 'lurk and poiMied. -'.m'-'imes rhaiVv- 

 bristly. Pinnules always separate, distinctly .stalked or alnio-t gi 

 never decurrent on the rliachis. 



7. PTERIS. Spore-cases on a transverse veinlike reee|>taele within the mar/in, 



which connects the ends of the veins, and is covered by the rellexed ihin 

 margin. Stalk light-colored (except in Doryopteri.s.) Pinnules or ultimate 

 segments adnate to the rhachis, often decurrent. 



8. PELL-5SA. Spore-cases in short lines on the upper part of the veins, confluent 



in a sub-marginal band of fructification, white within, more or less c<>\ 

 by the reflexed and commonly thin margin. Stalk dark and polished, some- 

 times chall'y. Pinnules mostly distinct, sessile or nearly so. 



4. Fruit-dots oblong or linear, on transverse reticulating veinleit, in rows near the 

 midrib and parallel to it: indusiuin of the same shape as the fruit-lint, opining 

 toward the midrib and attached by the outer edge to the fruitful i-mss-veiiiltt. 



9. WOODWARDIA. Fruit-dots straight, oblong-linear, in chain-like rows, partly 



sunken in shallow cavities of the under surface of the frond. Rather large, 

 native. Veins reticulated, often very much so. 



10. DOODIA. Fruit-dots oblong, often slightly crescent-shaped, not sunken in the 



frond. Exotics; the narrow fronds pinnatifid or simply pinnate. 



5. fruit-dots oblong or linear, on one or both sides of oblique veinlets, with i/irulu- 

 cres of like shape attached by one edije to the n inl< / mid free atony the other. 



11. ASPLEXIUM. Fruit-dots single and placed on the upper side of the veinleN, 



rarely double and set back to back on both sides of the same veinlet. Veins 

 mostly free. 



12. SCOLO'PENDRIUM. Fruit-dots linear, elongated, double and placed face to 



face along contiguous veinlcts; each pair thus seeming to be a single one 

 with an indusium opening along the middle. Frond simple, ribbon-shaped 

 or tongue-shaped, with free forking vein*. 



13. CAMPTOSORUS. Fruit-dots various, mostly short; those near the midrib 



double as in the last; the outer ones angled, curved or straight, simple as in 

 Asplenium. Frond simple, tapering to a long and narrow usually rooting 

 point. Veins reticulated. 



6. Fruit-dots on the back of the veins, rarely at the, ends, round or roundish, covered 

 at least when yuny by a special indusiuin of the same general shape. Sterile 

 and fertile fronds alike or nearly so. 



15. ASPIDIUM. Indusium flat, round or kidney-shaped, fixed at or near the cen- 



tre, opening all round the edge. Mostly rather large. Ferns, from once to thrice 

 pinnate. Veins free in the native species. 



16. CYSTOPTERIS. Indusium convex, fixed by the base partly under the fruit- 



dot, at length reflexed. Small Ferns, with delicate twice or thrice pinnate 

 fronds. Veins free. 



Sterile fronds broad and leafy : fertile ones with rontnti'tid anil rolled rip and pod- 

 like or berry-like diclsions: indusium reri/ e//s. /.. irrci/id-irl// semicircular, 

 placed at the base of a short receptacle to which the s/wre-cases tire attached. 



17. STRUTHTOPTERIS. Sterile fronds tall, with free veins, growing in a crown; 



fertile fronds coming up much later in an inner circle, pinnate, e:n-h pinna 

 rolled up from the edges into a somewhat cylindrical or necklace-like body, 

 containing the fruit. 



18. OXOCLEA. Fronds scattered on along creeping rootstock; sterile ..nes wit 



reticulated veins; fertile ones twice pinnate, the divi-imis contracted, rolled 

 up and berry-like. 



8. Involucres star-shaped, with broad and ragged or else capillary and jointed rays, 

 placed on the veins under the round fruit-dots, sometimes at first eaoeuping 

 the spore-cases. 



19. WOODSIA. Small Ferns, often growing in dense tufts: fronds once or twice- 



pinnate : veins forked, free. 



